On the never-vanishing topic of Islam in France, this article in the FT is pretty good.
Farhad Khosrokhavar, director of research at France’s Ecole des Hautes Etudes en Sciences Sociales, estimates that 15 to 20 per cent of French Muslims do not practise Islam at all. Fasting during Ramadan is considered a basic duty of the religion, yet only about 70 per cent of French Muslims even claim to do it. In short, European Islam has many of the same problems as European Christianity.
Via Art Goldhammer, unsurprisingly